Optimal Control of Reactive Power and Voltage for Distribution Systems

Abstract

According to the characteristics of distribution systems, this paper proposes a real-time algorithm for solving the optimal control strategies of reactive power and voltage in distribution systems. Under the conditions of bus voltage, branch reactive power used as controlled variables and the setting of the Tap Changing Under Load Transformers, reactive power compensation used as control variables, the strategies are gotten by using Linear Programming in accordance with the requirements of real-time control.There are several different objective functions in the paper. That is: (1).minimum real power losses; (2) minimum reactive power compensation; (3).maximum control gain. The objective functions mentioned above can be choosed in the light of specific circumstance.The paper can follow the sample date in the real-time control, simultaneously, identify the reactive power-voltage static characteristic on load bus, and consider its influence upon the optimal control strategies.The proposed technique has been tested on the IEEE 5-bus, 6-bus, modified 30-bus and Jiaxing distribution system(41-bus) in China, on the personal conputer. The optimal control strategies for different objective function mentioned above are obtained rapidly.